feat: soundboard, account menu, and call timer

Soundboard: the trigger travels over the WebSocket and every client in the
call plays the clip locally, instead of mixing it into the presser's
microphone or publishing a LiveKit track. No upstream bandwidth, no media
stack changes, and the clip is not degraded by voice processing.

Fan-out uses a new sendToRoomParticipants rather than sendToRoom: the latter
broadcasts a space room to the whole space, which is right for the presence
the sidebar shows and wrong for anything audible. The cooldown is enforced
server-side — a client-side one only slows down people not trying to abuse it,
and a soundboard is the easiest thing here to turn into a weapon. Playing is
open to anyone in the call; deciding what the buttons are needs MANAGE_SPACE.

Account menu: the name in the user bar had cursor-pointer and no handler, so
the interface was already promising a click that did nothing. Offers profile,
status and copy-id — not the Clips or account switching the reference design
shows, which would be dead UI here.

Call timer: startedAt comes from the server, so a late joiner sees the call's
age rather than their own arrival. Empty space rooms are destroyed already,
which is what makes the next call start from zero — no reset logic needed.

packages/server/src/db/schema.ts

@@ -633,3 +633,15 @@ export const voiceSessions = sqliteTable('voice_sessions', {
   userIdx: index('idx_voice_sessions_user').on(table.userId),
   openIdx: index('idx_voice_sessions_ended').on(table.endedAt),
 }));
+
+/** Soundboard clips, per space. The file lives in the normal upload dir. */
+export const soundboardSounds = sqliteTable('soundboard_sounds', {
+  id: text('id').primaryKey(),
+  spaceId: text('space_id').notNull().references(() => spaces.id, { onDelete: 'cascade' }),
+  name: text('name').notNull(),
+  filename: text('filename').notNull(),
+  uploaderId: text('uploader_id').references(() => users.id, { onDelete: 'set null' }),
+  createdAt: integer('created_at').notNull(),
+}, (table) => ({
+  spaceIdx: index('idx_soundboard_space').on(table.spaceId),
+}));